Lining for slots of dynamo-electric-machine elements.



F. YOUNG & E. HEITMANN Patented H0123, 1909.

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UNITED STATES PATENT OFFICE.

FREDERICK WILLTAM YOUNG, OF EAST ORANGE, AND EDWARD HEITMANN, F MONT- CLAIR, NEW JERSEY, ASSIGNORS TO CROCKER-WHEELER COMPANY, O]. .LMPERE, NEW JERSEY, CORPORATION OF NEW JERSEY.

DINING FOR SLOTS E DYNAMO-ELECTRIC-MACi-IINE ELEMENTSQ Application filed June 5, 1909. Serial No. 500,2 84.

b New Jersey, both citizens of the United the ends of the armature.

States ofAmerica, have invented a new and useful Improvement in Linings for Slots of Dynamo Electric Machine Elements, of which the following is a specification.

Our invention relates particularly to means for lining that portion of the walls of the coil-containing slots of a laminated dynamo-electric machine element which are en gaged by the bridging blocks for holding the windings in plac The object is'to provide means for electrically insulating the blocks from the laminae which will beof minimum thickness so as not to interfere with the magnetic functions of the bridging-blocks or encroach materially on the space in the slots required for the windings. A further object is to facilitate the assembling of the bridging-blocks.

In the accompanying sheet of drawings which forms, a part of this applieation Figure l'is a perspective of a. portion of a dynamo-electric machine element, with windings in section, bridging-blocks and linings constructed in accordance with our invention. Fig. 2 is aperspective of one of the lining troughs.

The invention is illustrated in connection with a laminated toothed armature A, constituting a dynamo-electric machine element with slots containing windings or coils W. The walls of the slots near their mouths and above the windin s are inclined, forming dovetail shaped ciannels. Into the channels thereby formed are inserted troughshaped metallic linings L which are provided externally with coatings of paper P attached thereto with shellac. These troughs are drawn into the channels from A hole It near one end of each trough serves for the insertion of a hook by which they are drawn into .place. When in place'steel or iron bridgjug-blocksv B are inserted from the end-of the armature, and, by reason of the smooth surface alforded by the metal of the troughs, are readily driven along them and tightly Specification of Letters Patent.

. blocks.

tween the walls Patented Nov. 23', 1909.

preserves the necessary insulation between laminae, and the metallic lining protects the paper from being cut through or abraded in the operation of inserting the bridging- Paper of but five thousandths of an inch in thickness has proved suitable for the purpose, and the metallic linings of sheet steel may be kept Within a thickness of two wedged inplace in thechannels. The paper one-thousandths of an inch, thereby rendering the electrical conductivity negligible. The combined thickness of paper and metal is much less than has been found necessary for paper when used without the metallic protection. In. lieu of paper the metallic linings may be 'coated with a hard japan or enamel.

What we claim asnew, and desire to secure by Letters Patent of the United States, 1s

1. The combination with a dynamdelectric machine element having coil-containing slots, of windings located in the slots, slotclosing bridging-blocks of magnetic material located in the slots, and metallic linings interposed between the-walls ofthe slots and the bridging-blocks, the linings being insulated from the slot walls, substantially as described.

2.'The combination with a dynamo-electric machine element havingcoil-containing slots, of windings located in the slots, slotclosing bridging-blocks of magnetic material located in the slots, and metallic linings provided with coatings of paper interposed beof the slots and the bridging-blocks, the paper adjoining the slot walls,'substantially as described.

3. The combination with a dynamo-electric machine element having coil-containing slots, of windings located in the slots, slotclosing bridging-blocks of magnetic material located in the slots, and externally insulated metallic troughs interposed between the walls of the slots and the bridgingbloeks, substantially as described.

4. As an article of manufacture, an exteriorly insulated metallic trough of high electrical resistance the sides of which are inclined toward ea'clr other whereby it is constructed to serve as a lining interposed between the walls of a coil-containing slot of a dynamo-electric machineelement' and a slot-closing bridging-block, substantially as described.

5. As an art-isle 0f manufacture, a metallic trough of high electrical. resistance providea exteriorly W h :1 coating of paper the sides of which. are incih. d tewmd. each other wherem it is constr'qicte 0 serve as a lining interposed between the Walls of a coilcontaining slot of a dynzuno-electric vmachine Signed by us at East Orange J this third day of June, 1909.

FREDERICK WILLIAM YOUNG. EDWARD HEI'IMANN. Vitnesses:

ANTHONY J. Punsmnvms, J. MACDONALD SMITH. 

